Siemens SINAMICS S120 Function Manual page 190

Extended functions
Motor changeover
Table 4-5
Parameters
p0130
p0180
p0186[0..3]
p0820, p0821
p0822 to p0824
p0826[0..3]
p0827[0..3]
p0830.1 to
p0830.4
p0831[0..3]
p0833[0..1]
Procedure for motor data set changeover
1. Start condition:
For synchronous motors, the actual speed must be lower than the speed at the
start of field weakening. This prevents the regenerative voltage from exceeding
the terminal voltage.
2. Cancel pulses:
The pulses are cancelled after a new drive data set is selected using p0820 to
p0824.
3. Open motor contactor:
Motor contactor 1 is opened r0830 = 0 and the status bit "Motor changeover
active" (r0835.0) is set.
4. Changeover drive data set:
The requested data set is activated (p0051 = requested data set).
5. Energize motor contactor:
After the feedback signal (motor contactor opened) for motor contactor 1 has
been received, the appropriate bit of r0830 is set and motor contactor 2 is
energized.
6. Enable pulses:
After the feedback signal (motor contactor closed) for motor contactor 2 has
been received, the bit "motor changeover active" (r0835.0) is reset and the
pulses are enabled. The motor has been changed over.
4-190
Settings for the example
Settings
4
4
0, 1, 2, 3
Digital inputs, DDS selection
0
1, 2, 3, 4
1, 2, 3, 4
Digital outputs, auxiliary
contactors
Digital inputs, auxiliary switches
0, 0
Note
Configure 4 MDS
Configure 4 DDS
The MDS are assigned the DDS.
The digital inputs to change over
the motor are selected via DDS
selection. Binary coding is used
(p0820 = bit 0 etc.).
Different numbers indicate a
different thermal model
The bits from p0830 are
assigned to the MDS. If p0827[0]
= 1, for example, bit p0830.1 is
set via DDS0 when MDS0 is
selected.
The digital outputs for the
auxiliary contactors are assigned
bits.
The digital inputs for the
feedback signal of the motor
contactors are assigned.
The drive controls the contactors
and the pulse cancellation.
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition